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Borrowing Arrangements - Summary of Unsecured Credit Facility (Detail)
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Debt Disclosure [Abstract]    
Weighted average rates 2.99% 3.15%
Range of effective rates, minimum 1.88% 2.68%
Range of effective rates, maximum 3.91% 3.91%